Marcum, W. (1991). Teenagers and group dynamics. Group Books.
Lua i Stíl Chicago (17ú heag.)Marcum, Walt. Teenagers and Group Dynamics. Colorado: Group Books, 1991.
Lua MLA (9ú heag.)Marcum, Walt. Teenagers and Group Dynamics. Group Books, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.